Q.

A ball hits the floor and rebounds after inelastic collision.  In this case

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a

The momentum of the ball just after the collision is the same as that just before the collision

b

The mechanical energy of the ball remains the same in the collision

c

The total momentum of the ball and the earth is conserved

d

The total energy of the ball and the earth is conserved

answer is C.

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Detailed Solution

By the conservation of momentum in the absence of external force total momentum of the system (ball + earth) remains constant.
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